Aircraft brake wheel with thermal insulation

Abstract

The application relates to an airplane brake wheel with a heat insulation device and belongs to the technical field of airplane wheel brakes. The airplane brake wheel comprises a wheel assembly and a brake assembly, and is characterized in that the heat insulation device is designed in the wheel assembly and the brake assembly, and the heat insulation device comprises a heat insulation ring, a heat insulation block, a heat insulation cylinder and a heat insulation ring. The heat insulation ring is sleeved and fixed on the outer surface of a guide rail and cooperates with a composite heat shield to realize full surrounding of a brake disc assembly and to block the heat transfer from the brake disc to the inner wall of a hub through air as a medium. The heat insulation block is installed between the guide rail and the hub to block the heat transfer from the brake disc to the inner wall of the hub through solid as a medium. The heat insulation cylinder is installed in the inner cavity of a brake shell, and the heat insulation ring is installed between a supporting ring and a reinforcing rib of the brake shell to jointly block the heat transfer from the brake disc to a brake shaft. The application reduces the heat transfer efficiency in the airplane brake wheel, guarantees the normal work of the brake wheel assembly and reduces the failure rate caused by high temperature.

Description

Technical Field

[0001] This invention belongs to the field of aircraft wheel braking technology, specifically relating to an aircraft brake wheel with a heat insulation device. Background Technology

[0002] Aircraft brake wheels are mounted on the aircraft landing gear and work in conjunction with the tires to perform functions such as takeoff, landing, high-speed taxiing, braking, and parking. An aircraft brake wheel consists of a wheel assembly and a brake assembly. The wheel assembly mainly includes the wheel hub, guide rails, bearings, seals, and valves; the brake assembly mainly includes the cylinder block, piston assembly, brake disc assembly, and brake housing. The brake shaft is installed within the brake wheel to support it.

[0003] During aircraft landing braking, the temperature of the brake disc assembly in the brake wheel is generally 600-900℃. Under conditions of aborted takeoff and some severe operating conditions, the temperature of carbon brake discs can reach over 1200℃. High temperatures are transmitted to various components of the brake wheel through air and solids via thermal radiation and conduction. High temperatures can cause carbonization of the oil used to drive the piston in the cylinder head, failure of various seals installed on the wheel (such as valve stem seals, seals at the joint between the inner and outer wheel hubs, and seals in the piston assembly), and malfunction of equipment within the brake axle (such as tire pressure signal transmitters, wheel speed sensors, and motors). Therefore, heat insulation devices must be installed in the wheel assembly.

[0004] According to the data, the thermal conductivity of air is 0.0244 W / (m·K), while that of aluminum alloys and steel is 80-230 W / (m·K). It can be seen that the thermal conductivity of metals is much higher than that of air. In order to protect the cylinder block, the seals installed on the wheel, and the equipment inside the brake shaft from operating normally under the specified temperature, it is necessary to reduce not only the temperature transfer through heat radiation in the air, but also the temperature transfer efficiency through heat conduction in solids.

[0005] Existing technologies for addressing brake wheel thermal protection typically employ either installing a composite heat shield between the wheel hub and the carbon brake disc assembly, or adding heat insulation sheets between the brake piston assembly and the brake disc assembly. Both composite heat shields and heat insulation sheets are made of heat-insulating materials. However, composite heat shields can only block the temperature transfer of heat during braking from the carbon brake disc to the wheel hub via air radiation. Furthermore, to facilitate visual inspection of the indicator rods and carbon brake discs along the flight path, and to check the remaining length of the indicator rod wear and the wear condition of the carbon brake discs, the composite heat shield should generally not be too long and should not enclose the carbon brake discs and pressure plates near the piston assembly. An excessively long composite heat shield would obstruct visual inspection, making it impossible to see the components. Therefore, the heat insulation effect of the existing composite heat shield structure is limited. If the composite heat shield is extended to enclose the carbon brake discs and pressure plates near the piston assembly, since the composite heat shield is generally located between two guide rails and press-fitted under the guide rails, the guide rails must be removed before the composite heat shield can be removed for visual inspection, causing inconvenience. The heat insulation plate installed between the brake piston assembly and the brake disc assembly can only prevent heat transfer from the brake disc assembly to the cylinder block via a solid medium. It is evident that the above two heat insulation methods fail to effectively prevent heat transfer from the brake disc assembly to the wheel hub wall and brake shaft. Furthermore, during aircraft braking, the carbon brake disc is in direct contact with the steel clamp, the steel clamp with the guide rail, and the guide rail with the wheel hub wall. Heat will be quickly transferred to the wheel hub wall through the metal medium. The carbon brake disc is in contact with the brake housing, and the brake housing with the brake shaft. Heat will also be quickly transferred to the brake shaft through the metal medium. Excessive heat in the wheel hub and brake shaft can cause the wheel seals to fail and the equipment inside the brake shaft to malfunction. Summary of the Invention

[0006] Technical problem to be solved: In order to avoid the shortcomings of the prior art, the present invention provides an aircraft brake wheel with a heat insulation device. The heat insulation ring, heat insulation block, heat insulation cylinder and heat insulation ring are set in the existing wheel assembly. The heat insulation ring is fixed to the outer surface of the guide rail, the heat insulation block is installed between the guide rail and the wheel hub, the heat insulation cylinder is installed in the inner cavity of the brake housing, and the heat insulation ring is installed between the support ring and the brake housing reinforcing rib. This solves the problem that the existing heat insulation solution cannot effectively block the heat from being transferred to the wheel hub and brake shaft.

[0007] The technical solution of the present invention is: an aircraft brake wheel with a heat insulation device, comprising a wheel assembly and a brake assembly; the wheel assembly includes a wheel hub, a guide rail, a tapered roller bearing, a sealing ring, a composite heat insulation screen, and a valve stem; the brake assembly includes a cylinder seat, a piston assembly, a brake disc assembly, and a brake housing;

[0008] The features are as follows: the wheel assembly further includes a heat insulation ring and a heat insulation block; the heat insulation ring is circular in shape, fitted onto the outer circumference of the guide rail and fixedly connected to the guide rail, one end of the heat insulation ring extends to the composite heat insulation screen, and the other end extends to the piston assembly, used to surround the brake disc assembly not covered by the composite heat insulation screen; the heat insulation block has a threaded through hole in the center, and multiple protrusions for mounting the guide rail are evenly distributed in the same circumference of the inner wall of the wheel hub, the heat insulation block is located between the protrusions and the guide rail, and the guide rail, heat insulation block and wheel hub are fixedly connected in sequence by bolts;

[0009] The brake assembly also includes a heat insulation ring and a heat insulation cylinder. The heat insulation ring is annular and is fitted onto a support ring that supports the brake housing. Its inner wall contacts the support ring, and its outer wall contacts the reinforcing ribs of the brake housing. The heat insulation cylinder is an assembled cylindrical structure with baffles at both ends. The baffles have multiple mounting holes for connecting to the brake housing. The heat insulation cylinder is installed in the inner cavity of the brake housing and covers the inner wall of the brake housing. The baffles at both ends have through holes at their centers to accommodate the brake shaft.

[0010] The heat insulation ring, heat insulation block, heat insulation coil, and heat insulation cylinder are all made of heat insulation material.

[0011] A further technical solution of the present invention is: the heat insulation ring has a plurality of radially recessed portions evenly distributed along the axial direction, the number of the recessed portions is the same as the number of guide rails, the bottom surface of the recessed portion contacts the outer circumferential surface of the guide rail, and one end of the recessed portion is provided with a rivet hole for fixing the guide rail by rivets.

[0012] A further technical solution of the present invention is that the heat insulation ring is made of carbon as the matrix and is manufactured by CVD process.

[0013] A further technical solution of the present invention is that the thermal conductivity of the material of the heat insulation ring is 0.5 W / (m·K), and it has compressible and recoverable characteristics.

[0014] A further technical solution of the present invention is: two grooves are symmetrically provided on both sides of the threaded hole of the heat insulation block, and a boss corresponding to the groove of the heat insulation block is provided on the top surface of the protrusion of the inner wall of the hub. The groove of the heat insulation block is connected with the boss on the protrusion and anti-rotation limit.

[0015] A further technical solution of the present invention is that the heat insulation block is made of titanium alloy.

[0016] A further technical solution of the present invention is as follows: one end baffle of the heat insulation cylinder contacts the inner wall of the top plate of the brake housing, the other end baffle of the heat insulation cylinder contacts the inner wall of the reinforcing rib of the brake housing, and the outer surface of the heat insulation cylinder contacts the circumferential inner wall of the brake housing; the mounting holes on the heat insulation cylinder baffle are threaded holes evenly distributed in the same circumference, and the top plate of the brake housing and the reinforcing rib of the brake housing are provided with threaded holes that match the mounting holes on the heat insulation cylinder, and the heat insulation cylinder is fixed to the brake housing by bolts.

[0017] A further technical solution of the present invention is that the materials of the heat insulation cylinder and the heat insulation ring are both 3253 amide-imide layered glass cloth.

[0018] Beneficial effects

[0019] The beneficial effects of this invention are as follows: By adding a heat insulation device to the existing brake wheel, specifically including a heat insulation ring, a heat insulation block, a heat insulation cylinder, and a heat insulation ring, and using heat-resistant materials, combined with its unique structural design, and effectively installing it in a specific position in the brake wheel, this invention blocks the high temperature from the brake disc assembly during aircraft braking, reduces the temperature transfer efficiency of heat conduction through solids, and also improves the shortcomings of existing composite heat insulation screens that cannot completely surround the brake disc assembly, effectively blocking heat transmission to the wheel hub and brake shaft.

[0020] In this invention, a heat insulation ring is used to isolate the heat conduction from the carbon brake disc to the inner wall of the wheel hub during braking. The heat insulation ring is fitted and fixed to the outer periphery of the guide rail and overlaps the radial periphery of the composite heat insulation screen, working together with the composite heat insulation screen to achieve full enclosure of the brake disc assembly. Furthermore, the heat insulation ring described in this invention is easy to install and remove. During visual inspection of the flight path, only the heat insulation ring needs to be removed for inspection, thus blocking heat transfer to the wheel hub and avoiding the inconvenience of visual inspection caused by extending the composite heat insulation screen.

[0021] This invention relates to a heat insulation block installed between the guide rail and the wheel hub. The heat insulation block is made of titanium alloy, which has a thermal conductivity coefficient of 15 W / (m·K), much lower than that of aluminum alloy and alloy steel, effectively providing heat insulation while ensuring the required strength. In the brake disc assembly, the outer circumferential groove of the moving disc slides into the guide rail, and a steel clamp is installed on the groove. The steel clamp contacts the guide rail. During braking, heat is transferred from the moving disc of the carbon brake disc to the steel clamp, and then from the steel clamp to the guide rail. In existing structures, because the guide rail is directly connected to the wheel hub, heat is quickly transferred from the carbon brake disc to the wheel hub. This invention effectively provides heat insulation by adding a heat insulation block between the guide rail and the wheel hub.

[0022] The heat insulation cylinder and heat insulation ring of this invention work together to effectively block the transfer of heat from the brake housing to the brake shaft, thereby protecting internal equipment such as tire pressure signal transmitters, wheel speed sensors, and motors, ensuring their normal operation. The heat insulation cylinder and heat insulation ring of this invention are made of 3253 amide-imide layered glass cloth, which has excellent heat resistance and heat insulation properties. In the brake disc assembly, the stationary disc is connected to the brake housing via a key. During braking, heat is transferred from the stationary disc of the carbon brake disc to the brake housing. In existing mechanisms, one end of the brake housing's top plate is fixedly connected to the cylinder block, while the other end's reinforcing rib is indirectly connected to the brake shaft via a support ring. The support ring is made of steel and has no heat insulation function; heat from the brake housing is quickly transferred to the brake shaft through the support ring. Furthermore, the high temperature inside the brake housing cavity is also transferred over a large area via air radiation to the brake shaft, which penetrates the cavity. This invention effectively provides heat insulation by installing a heat insulation cylinder on the inner wall of the brake housing cavity and a heat insulation ring between the support ring and the brake housing reinforcing rib. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of the aircraft brake wheel with heat insulation device according to the present invention;

[0024] Figure 2 This is a schematic diagram of the installation of the heat insulation ring and heat insulation block in this invention;

[0025] Figure 3 This is a structural diagram of the heat insulation ring in this invention;

[0026] Figure 4 This is a structural diagram of the heat insulation block in this invention;

[0027] Figure 5 This is a schematic diagram showing the connection relationship between the heat insulation block, the guide rail, and the wheel hub in this invention;

[0028] Figure 6 This is a schematic diagram of the installation of the heat insulation cylinder and heat insulation ring in this invention;

[0029] Figure 7 This is a structural diagram of the heat insulation ring in this invention;

[0030] Figure 8 This is a schematic diagram of the semi-cylinder structure of the heat insulation cylinder in this invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Heat insulation ring, 2. Heat insulation block, 3. Heat insulation cylinder, 31. Baffle, 4. Heat insulation ring, 5. Support ring, 6. Brake shaft, 7. Brake housing, 71. Reinforcing rib of brake housing, 72. Top plate of brake housing, 8. Wheel hub, 81. Protrusion, 9. Guide rail, 10. Tapered roller bearing, 11. Sealing ring, 12. Composite heat insulation screen, 13. Valve nozzle, 14. Cylinder seat, 15. Carbon disc assembly, 16. Piston assembly, 17. Bolt. Detailed Implementation

[0032] The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the invention, and should not be construed as limiting the invention.

[0033] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] The main objective of this invention is to achieve heat insulation of the brake wheel, comprehensively and effectively blocking the heat transfer from the brake disc assembly 15 to the wheel hub 8, brake shaft 6, and cylinder block 14. By analyzing and studying the heat conduction path of the brake disc assembly 15, selecting suitable heat insulation materials, and designing a matching heat insulation device, an aircraft brake wheel with a heat insulation device is designed to reduce the heat transfer efficiency from the brake disc assembly 15 to the wheel hub 8, brake shaft 6, and cylinder block 14 during aircraft braking, ensuring the normal operation of the brake wheel, reducing the failure rate caused by high temperature, and extending the service life of the wheel assembly.

[0035] like Figure 1 As shown, the present invention discloses an aircraft brake wheel with a heat insulation device, comprising a wheel assembly and a brake assembly. The wheel assembly mainly includes a wheel hub 8, a guide rail 9, a pair of tapered roller bearings 10, a sealing ring 11, a composite heat insulation screen 12, a valve stem 13, a heat insulation ring 1, and a heat insulation block 2; the brake assembly mainly includes a cylinder seat 14, a piston assembly 16, a brake disc assembly 15, a brake housing 7, a heat insulation sheet, a heat insulation cylinder 3, and a heat insulation ring 4.

[0036] The hub 8 has an inner and outer half-hub docking structure. The inner half-hub has 11 protrusions 81 evenly distributed along the same circumference on its inner wall for mounting guide rails 9. There are 11 guide rails 9, and 11 heat insulation blocks 2 are also provided. The heat insulation blocks 2 are mounted on the top of the protrusions 81, located between the guide rails 9 and the hub 8. Specifically, as shown... Figure 2 , 4As shown in Figure 5, the heat insulation block 2 has a block structure and is made of titanium alloy with a low thermal conductivity. This material not only insulates against heat but also has sufficient strength to meet the strength requirements during braking. The heat insulation block 2 has a threaded through hole in its center, and two grooves are symmetrically arranged on both sides of the threaded hole. Correspondingly, a boss corresponding to the groove of the heat insulation block 2 is provided on the top surface of the protrusion 81 on the inner wall of the wheel hub. The groove of the heat insulation block 2 aligns with the boss on the protrusion 81 to achieve anti-rotation limiting. Screws 17 sequentially fix the guide rail 9, heat insulation block 2, and wheel hub 8 together. Eleven sets of composite heat insulation screens 12 are installed between the guide rails 9.

[0037] like Figure 1 As shown, a pair of tapered roller bearings 10 are mounted at both ends of the central shaft hole of the hub 8, for connecting and supporting the hub 8 and the brake shaft 6. A sealing ring 11 is installed in the sealing ring groove at the mating point of the two inner and outer half-hubs. A valve stem 13 is mounted on the outer hub.

[0038] like Figure 2-3 As shown, the heat insulation ring 1 is an integral circular structure, fitted onto the outer circumference of the 11 guide rails 9 and fixedly connected to them. Specifically, the heat insulation ring 1 has multiple radially recessed portions evenly distributed along its axial direction, the number of which is the same as the number of guide rails 9. The bottom surfaces of the 11 recessed portions form the minimum inner diameter of the heat insulation ring 1, and the minimum inner diameter surface of the heat insulation ring 1 mates with the maximum outer diameter surface formed by the 11 guide rails 9, with a fitting clearance of 0.1 mm, meaning the bottom of the recessed portion contacts the outer circumferential surface of the guide rail 9. One axial end of the recessed portion has a rivet hole for fixed connection with the guide rails 9 via rivets. The end of the heat insulation ring 1 connected to the guide rails 9 extends to the composite heat insulation screen 12, located around the periphery of the composite heat insulation screen 12, and overlaps with it; the other end of the heat insulation ring 1 extends to the piston assembly 16, used to surround the brake disc assembly 15 not covered by the composite heat insulation screen 12. The heat insulation ring 1 is made of carbon as the matrix and manufactured by CVD process. The thermal conductivity of the heat insulation ring 1 is 0.5 W / (m·K), and it has compressible and recoverable characteristics.

[0039] like Figure 1 As shown, the brake assembly is fully mounted on the brake shaft 6, located inside the wheel hub 8. A piston assembly 16 is installed inside the cylinder block 14, providing braking force to the brake disc assembly 15. The brake disc assembly 15 is mounted on the brake housing 7. One end of the brake housing 7, the top plate 72, is fixedly connected to the cylinder block 14. The reinforcing rib 71 of the brake housing is supported and connected to the brake shaft 6 via a support ring 5 and a heat insulation ring 4. Specifically, as... Figure 6 , Figure 7As shown, the support ring 5 is fitted onto the brake shaft 6. To prevent the support ring 5 from directly contacting the reinforcing rib 71 of the brake housing, a heat insulation ring 4 is fitted onto the support ring 5 to block heat transfer. The heat insulation ring 4 is annular and made of 3253 amide-imide layered glass cloth, which has good heat resistance and heat insulation properties. The inner wall of the heat insulation ring 4 is in contact with the support ring 5, and the outer wall of the heat insulation ring 4 is in contact with the reinforcing rib 71 of the brake housing.

[0040] The brake disc assembly 15 includes a pressure plate, multiple moving discs, multiple stationary discs, a pressure plate, and a pressure cup connecting the pressure plate and the cap of the brake housing 7. The pressure plate is located near the piston assembly 16, adjacent to the moving disc, followed by the stationary discs, with the moving and stationary discs alternating. The pressure plate is located near the cap of the brake housing 7, and one end of the pressure cup is connected to the pressure plate, while the other end is connected to the brake housing 7. The outer circumferential edge of the moving disc has a groove for sliding connection with the guide rail 9, and a steel clamp is installed at the groove of the moving disc. The inner rings of the pressure plate, stationary discs, and pressure plate have keyways that connect with the convex key on the outer diameter of the brake housing 7.

[0041] When the aircraft is taxiing, the brake wheel rolls on the ground with the tires, and the moving disc rotates with the wheel hub 8. The pressure plate, stationary disc, and bearing plate located on the brake housing 7 remain relatively stationary. When the brake wheel is braked, the piston in the piston assembly 16 mounted on the cylinder seat 14 moves forward under the action of oil pressure, pressing the moving disc and stationary disc, generating friction between the moving disc and stationary disc, and braking the brake wheel. When the brake pressure is released, the piston retracts, causing the moving disc and stationary disc to separate, and the aircraft wheel is released from the brake.

[0042] In order to prevent the high temperature generated by the brake disc assembly 15 during braking from being transmitted to the cylinder seat 14, a heat insulation plate is installed at the end of the piston assembly 16 facing the pressure plate to prevent the oil in the cylinder seat 14 and piston assembly 16 from carbonizing and the seals from failing.

[0043] The heat insulation cylinder 3 is installed inside the brake housing 7 and covers the inner wall of the brake housing 7 to prevent heat transferred from the brake disc assembly 15 to the brake housing 7 from being transferred to the brake shaft 6. The heat insulation cylinder 3 is an assembled cylindrical structure. Both ends of the heat insulation cylinder 3 are provided with baffles 31. The baffles 31 are provided with multiple mounting holes 32 for connecting with the brake housing 7. The center of both end baffles 31 is provided with a through hole to accommodate the brake shaft 6. Specifically, in this embodiment, the heat insulation cylinder 3 is a cylindrical structure formed by joining two half-cylinders along the axis. Both ends of the half-cylinders are provided with semi-annular baffles, and the two half-cylinders are joined to form an integral cylindrical structure. One end baffle 31 of the heat insulation cylinder 3 contacts the inner wall of the top plate 72 of the brake housing, and the other end baffle 31 of the heat insulation cylinder 3 contacts the inner wall of the reinforcing rib 71 of the brake housing. The outer surface of the heat insulation cylinder 3 contacts the circumferential inner wall of the brake housing 7. The mounting holes on the heat insulation cylinder baffle 31 are threaded holes evenly distributed within the same circumference. Correspondingly, the top plate 72 of the brake housing and the reinforcing rib 71 of the brake housing are also provided with threaded holes that match the mounting holes on the heat insulation cylinder 3. The heat insulation cylinder 3 is fixed to the brake housing 7 by bolts. The material of the heat insulation cylinder 3 is 3253 amide-imide layered glass cloth board, which has good heat resistance and heat insulation properties.

[0044] During the braking process, the brake disc assembly 15 generates a high temperature of up to 1200°C. This high temperature is transferred to various components of the brake wheel through heat radiation and heat conduction, using air and solids as the medium. The heat insulation ring 1, in conjunction with the composite heat insulation screen 12, blocks the heat conduction from the brake disc assembly 15 to the inner wall of the wheel hub 8 via air during braking. The heat insulation block 2, installed between the guide rail 9 and the wheel hub 8, blocks the heat conduction from the brake disc assembly 15 to the inner wall of the wheel hub 8 via solid medium, i.e., the transmission path of moving disc-steel clamp-guide rail 9-wheel hub in the brake disc assembly 15. The heat insulation cylinder 3, installed in the inner cavity of the brake housing 7, blocks the heat conduction from the brake housing 7 to the brake shaft 6 via air medium. The heat insulation ring 4, installed between the support ring 5 and the brake housing reinforcing rib 71, blocks the heat conduction from the brake housing 7 to the brake shaft 6 via solid medium, i.e., the transmission path of stationary disc-brake housing 7-support ring 5-brake shaft 6 in the brake disc assembly 15. The heat insulation sheet installed on the pressure plate blocks the heat conduction from the brake disc assembly 15 to the cylinder seat 14. Compared with the prior art, the aircraft brake wheel of the present invention effectively reduces the heat transfer efficiency from the brake disc assembly 15 to the hub 8, brake shaft 6, and cylinder seat 14, ensuring the normal operation of the brake wheel.

[0045] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the present invention.

Claims

1. An aircraft brake wheel with a heat insulation device, comprising a wheel assembly and a brake assembly; the wheel assembly comprising a wheel hub (8), a guide rail (9), a tapered roller bearing (10), a sealing ring (11), a composite heat insulation screen (12), and a valve (13); the brake assembly comprising a cylinder seat (14), a piston assembly (16), a brake disc assembly (15), and a brake housing (7). Its features are: The wheel assembly also includes a heat insulation ring (1) and a heat insulation block (2); the heat insulation ring (1) is an overall ring shape, fitted on the outer circumference of the guide rail (9) and fixedly connected to the guide rail (9); one end of the heat insulation ring (1) extends to the composite heat insulation screen (12) and the other end extends to the piston assembly (16), used to surround the brake disc assembly (15) not covered by the composite heat insulation screen (12); the heat insulation block (2) has a threaded through hole in the center; multiple protrusions (81) for installing the guide rail (9) are evenly distributed in the same circumference of the inner wall of the wheel hub (8); the heat insulation block 2 is located between the protrusions (81) and the guide rail (9); the guide rail (9), the heat insulation block (2) and the wheel hub (8) are fixedly connected in sequence by bolts (17); The brake assembly also includes a heat insulation cylinder (3) and a heat insulation ring (4); the heat insulation ring (4) is annular and is fitted onto a support ring (5) for supporting the brake housing (7), with its inner wall in contact with the support ring (5) and its outer wall in contact with the reinforcing rib (71) of the brake housing (7); the heat insulation cylinder (3) is an assembled cylindrical structure, with baffles (31) at both ends of the heat insulation cylinder (3), and multiple mounting holes (32) on the baffles (31) for connecting with the brake housing (7), the heat insulation cylinder (3) is installed in the inner cavity of the brake housing (7) and covers the inner wall of the brake housing (7), and the center of the baffles (31) at both ends is provided with a through hole for accommodating the brake shaft (6) to pass through; The heat insulation ring (1) has multiple radially recessed portions evenly distributed around its circumference along the axial direction. The number of recessed portions is the same as the number of guide rails (9). The bottom surface of the recessed portion contacts the outer circumferential surface of the guide rail (9). One end of the recessed portion is provided with a rivet hole for fixing the guide rail (9) with a rivet. The heat insulation cylinder (3) is composed of two half-cylinders joined together along the axis. Both ends of the two half-cylinders are provided with semi-annular baffles, which are joined together to form an integral cylindrical structure. One end baffle (31) of the heat insulation cylinder (3) contacts the inner wall of the top plate (72) of the brake housing, and the other end baffle (31) of the heat insulation cylinder (3) contacts the inner wall of the reinforcing rib (71) of the brake housing. The outer surface of the heat insulation cylinder (3) contacts the circumferential inner wall of the brake housing (7). The mounting holes on the baffle (31) of the heat insulation cylinder are threaded holes evenly distributed in the same circumference. The top plate (72) of the brake housing and the reinforcing rib (71) of the brake housing are provided with threaded holes that match the mounting holes on the heat insulation cylinder (3). The heat insulation cylinder (3) and the brake housing (7) are fixed by bolts. The heat insulation ring (1), heat insulation block (2), heat insulation cylinder (3), and heat insulation ring (4) are all made of heat insulation material.

2. The aircraft brake wheel with heat insulation device according to claim 1, characterized in that: The heat insulation ring (1) is made of carbon as the matrix and manufactured by CVD process.

3. The aircraft brake wheel with heat insulation device according to claim 1, characterized in that: The thermal conductivity of the material of the heat insulation ring (1) is 0.5 W / (m·K), and it has compressible and recoverable characteristics.

4. The aircraft brake wheel with heat insulation device according to claim 1, characterized in that: The heat insulation block (2) has two grooves symmetrically arranged on both sides of the threaded hole. The top surface of the protrusion (81) on the inner wall of the hub (8) is provided with a boss corresponding to the groove of the heat insulation block (2). The groove of the heat insulation block (2) is connected to the boss on the protrusion (81) and prevents rotation and limits the movement.

5. The aircraft brake wheel with heat insulation device according to claim 1, characterized in that: The heat insulation block (2) is made of titanium alloy.

6. The aircraft brake wheel with heat insulation device according to claim 1, characterized in that: The materials of the heat insulation cylinder (3) and the heat insulation ring (4) are both 3253 amide-imide layered glass cloth.

Images